Feeding mechanism for sewing machines



Jan. 31, 1939. s. PYLUCK 2,145,554

' 4 FEEDING MECHANISM FOR SEWING MACHINES Filed March 13, 1957' 3 Sheets-Sheet 2 1 Steven lghw Jan. 31, 1939. s. PYLUCK 2,145,554

FEEDiNG MECHANISM FOR SEWING MACHINES Filed March 15, 1937 3 Sheets-Sheet 3 1 .6 5i X U 44 i 14" 3mm 1 1 M 7' Steven, @flwe Wmeov Patented Jan. 31, 1939 PATENT OFFICE.

FEEDING lWECl-IANISM FOR SEWING MACHINES Steven Pyluck, Maine, N. Y., assignor to The Singer Manufacturing Company,

Elizabeth,

N. J., a corporation of New Jersey Application March 13,

14 Claims.

This invention relates to feeding mechanisms for sewing machines and has for its primary object to improve the sewing conditions incidental to stitching articles such as shoe-Vamps and the like.

A more specific object of this invention is to provide improved means for feeding work past the stitch-forming mechanism of a sewing machine which is particularly adapted toform, in one operation, two separate and narrowly spaced seams of lock-stitches. Other objects of the invention will be apparent from the following description and claims.

The invention consists in the devices, combinations and arrangements of parts hereinafter described in connection with the accompanying drawings which illustrate one embodiment of the invention and in which:

Fig. 1 represents a vertical longitudinal section, partly in front elevation, of a left-hand, cylindrical work-arm type of sewing machine containing the present improvement. Fig. 2 is a bottom plan view of the machine, with the endcap of the work-arm shown in section. Fig. 3 illustrates, in perspective. the component parts of the feed-wheel or feed-ring and its supporting bracket. Fig. 4 represents an enlarged section of a portion of the machine base, on substantially the line 4-4 of Fig. 1. Fig. 5 is an enlarged top plan view of the free end portion of the workarm of the machine, with the end cap removed. Fig. 6 represents an enlarged vertical section of the work-arm adjacent to the feed-wheel, and also shows the presser devices and the needles in side elevation. Fig. 7 represents a detail sectional view of the feed-wheel drive, the section being taken substantially on the line l-'i of Fig. 6.

.As above indicated, the present invention has been embodied in a left-hand sewing machine of the cylindrical work-arm type, the drawings illustrating this sewing machine as having a frame comprising a hollow bed I from which extends a reduced portion forming the work-supporting arm 2, the free end of the work-arm 2 being normally closed by a removable end-cap 3. Rising from the bed I is the hollow standard 4 of a bracket-arm 5 which terminates in a head 6 overhanging the free end of the workearm 2.

Journaled in the bracket-arm 5 and extending longitudinally thereof is a rotary main actuating shaft 1 carrying at one end a combined beltpulley and balance-wheel 8. At its opposite end, the main-shaft I carries a crank-disk 9, connected 55 by means of a link In to a needle-bar I i journaled 1937, Serial No. 130,615

for vertical reciprocation in the bracket-arm head 6. At its lower end, the needle-bar ll carries two needles I2 and [3 set in a vertical plane inclined to the vertical plane containing the axis of rotation of the main-shaft l. The needles i2 and I3 are preferably disposed so'as to have contacting shanks, whereby the reduced blades of the needles are very narrowly spaced to form two separate seams, the narrowness of the spacing of the seams being accentuated by the inclined setting of the needles as above described.

Cooperating with the needles i2, I3 in the formation of lock-stitches are two loop-takers I l and iii of the vertical-axis rotary hook type, the loop-taker M having a loop-seizing beakit and the loop-taker l5 having a loop-seizing beak l5. Journaled in each of said loop-takers is the usual thread-case i6 containing a threadbobbin ii, the thread-cases being restrained in the usual manner against rotation with the respective loop-takers. The loop-taker I4 is carried by short vertically-disposed shaft I Bjournaled in a bracket i9 and the loop-taker i5 is similarly carried by a short vertically-disposed shaft 20 journaled in a bracket 2|, the brackets l9 and 2| being suitably secured within and spaced from each other lengthwise of the workarm 2.

Secured to the lower ends of the loop-taker shafts l8 and 20 are driven bevel-gears 22 engaged by driving bevel-gears 23 which are carried by a loop-taker actuating shaft 24, the ratio of the gears 22 and 23 being such that the shafts it and 20 rotate twice for each rotation of their driving shaft 24. The shaft 24 extends lengthwise of and is suitably journaled in the workarm 2, in substantial parallelism with the main shaft I, said shaft 24 having relatively offset cranks 25, within the frame-base l, which cranks are connected by pitmans 26 with similarly offset cranks 21 of the main-shaft 1, whereby the shafts l and 24 rotate in one-to-one relationship.

In accordance with the present invention, the work is advanced crosswise of the work-arm 2 by a feeding mechanism comprising a feed-wheel or feed-ring 28 rotatable about an axis parallel to the axis of rotation of the loop-taker actuating shaft 24. The feed-ring 28 is disposed between the axes of rotation of the loop-takers i4 and i5, and at the same side of the paths of reciprocation of the two needles l2 and 13, the upper portion of said feed-ring 28 projecting through a feed-slot 29 provided in a work-supporting throatplate 30. The throat-plate 30 is secured by screws 3| upon the work-arm 2 and is also provided with two needle-apertures 32 and 33 for receiving the respective needles l2 and IS. The needle-aperture 32 is preferably located closely adjacent; to the feed-slot 29, while the needleaperture 33 is disposed at thesame side of said feed-slot as the aperture 32 but is spaced slightly farther from the feed-slot 29 nd is also located slightly in advance of the needle-aperture 32. In other words, the line connecting the needleapertur'es is inclined to the line of feed.

The feed-ring 29 is rotatably supported by a bracket 34 secured at opposite sides thereof by set-screws 35 which are threaded into the front and rear side walls of the work-arm 2, said bracket 34 having at its lower end an annular recess 36 and a complemental cap-plate 91 which together provide an aperture for receiving the loop-taker actuating shaft 24, whereby said shaft serves to steady the bracket 34. The bracket 34 is cut away to provide an annular feed-ring supporting flange 38 and a segmental feed-ring clearance recess 39, said flange 39 being slidably embraced by the feed-ring 29 and being itself formed as a ring to afford the requisite clearance for the loop-taker l4. fined upon the annular bracket-flange 39 by a segmental retaining-plate 49 secured by screws 4| threaded into lugs 42 extending inwardly from the flange 38.

The toothed periphery of thefeed-ring 29 is engaged by the teeth of a pinion 44 rotatably supported upon a stud-bolt 45 secured upon the bracket 34 near the bottom thereof, whereby the pinion 44 extends into the bracket-recess 39. In driving engagement with the pinion 44 is a driving gear 49 comprising the toothed, reduced end of a feed-ring actuating shaft 41 which is rotatably journaled in suitable bearings provided in the work-arm 2, in substantial parallelism with the loop-taker actuating shaft 24. At its opposite end and within the frame-base I, the feed-shaft 41 carries a ratchet-wheel 49 engaged by pawls 49 and 50, pivotally hung adjacent each other upon a fulcrum-stud 5i secured upon a rockarm 52. The pawls 49 and 59 are preferably of unequal lengths, so that the free ends of said pawls are spaced from each other a less distance than the spacing of the ratchet-wheel teeth, thereby minimizing lost motion. Springs 53 are secured adjacent each other upon the rock-arm 92 by a screw 54, said springs each bearing upon one of the pawls 49, 50 to yieldingly hold said pawls in engagement with the ratchet-wheel 48.

The rock-arm 52 has an apertured boss 55 pivotally embracing a stud-bolt 56 secured upon a block 51 which is fastened against the inner face of the rear side wall of the frame-base by a bolt 59. Connected to the rock-arm 52, by a pivotscrew 59, is the lower end of a pitman 69, of which the upper end is provided with a strap 9| embracing an adjustable eccentric 62 carried by the main shaft 1.

It will be understood, from the foregoing description, that upon rotation of the main-shaft 1, the feed-ring 29 will be intermittently rotated to advance the work crosswise of the work-arm 2. However, it will be obvious that the feed-shaft 41 may be continuously rotated, if desired.

Opposed to the feed-ring 29 is a presser-roller 63 which is preferably pivotally mounted upon a bracket 94 in any usual or suitable manner for lateral swing-out movement into an inoperative position. The bracket 64 is suitably carried by the lower end of the usual spring-depressed presser-bar 65, to which is also suitably secured The feed-ring 29 is held conthe stripper-finger 99. Another stripper-finger 91 is carried by the bracket 64 and partakes of the lateral movements thereof.

While the feeding mechanism'has been herein described as embodied in a two-needle vamp-. ing" sewing machine, it is also adapted for use in a single needle machine, in which it is desirable forthe needle path of reciprocation and the loop-taker axis to be disposed at opposite sides of the feed-ring, as for example in a sewing machine designed for stitching close to the end of the work-arm.

Having thus set forth the nature of the invention, what I claim herein is:--

1. In a sewing machine, in combination, a work-support, a reciprocatory needle operating through said work-support, means for reciprocating said needle, a rotary loop-taker complemental to said needle in the formation of stitches and disposed below said work-support, means for rotating said loop-taker, a rotary work-advancing feed-ring operating through said work-support and rotatable in a plane between the path of reciprocation of said needle and the axis of rotation of said loop-taker, and means for rotating said feed-ring.

2. In a sewing machine, in combination, a work-advancing feed-ring, means for rotating said feed-ring, a needle having a path of reciprocation at one side of said feed-ring, a loop-taker complemental to said needle in the formation of stitches and having its operative path of movement extending through said feed-ring, and means for actuating said loop-taker.

3. In a sewing machine, in combination, a vertically reciprocatory needle, means for reciprocating said needle, a vertical-axis rotary looptaker complemental to said needle in the formation of stitches, means for rotating said looptaker, a work-advancing feed-ring rotatable in a vertical plane between the path of reciprocation of said needle and the axis of rotation of said loop-taker, and means for rotating said feed-ring.

4. In a sewing machine, in combination, a work-advancing feed-ring, means for rotating said feed-ring, a pair of reciprocatory needles having their paths of reciprocation at the same side of said feed-ring, a pair of rotary loop-takers complemental to said needles in the formation of stitches and disposed with their axes of rotation at opposite sides of said feed-ring, and means for rotating said loop-takers.

5. In a sewing machine, in combination, a pair of reciprocatory needles, a feed-ring rotatable about an axis transverse to the paths of reciprocation of said needles, a pair of rotary loop-takers complemental to said needles in the formation of stitches, said loop-takers having their respective axes of rotation disposed at opposite sides of the plane of rotation of said feed-ring and substantially parallel to the paths of reciprocation. of

iii)

said feed-ring, and means for rotating said looptakers;

7. In a sewing machine, in combination, a work-advancing feed-ring, means for rotating said feed-ring, a pair of reciprocatory needles spaced from each other in a direction inclined to the line of feed and having their paths of reciprocation at the same side of said feed-ring, a pair of rotary loop-takers complemental to said needles in the formation of stitches and having their respective axes of rotation at opposite sides of said feed-ring; and means for rotating said loop-takers.

8. A sewing machine having a frame including a work-supporting arm free at one end thereof, a work-advancing feed-ring rotatably supported within said work-arm, a feed-ring. actuating shaft journaled within and extending lengthwise of said work-arm, a pair of reciprocatory needles, a pair of rotary loop-takers journaled within said work-arm for rotation about axes disposed at opposite sides of said feed-ring, a loop-taker actuating shaft journaled within said work-arm in substantial parallelism with said feed-ring actuating shaft, and means for rotating said shafts.

9. A sewing machine having a frame including a work-supporting am free at one end thereof. a work-advancing feed-ring supported within said work-arm for rotation in a plane transverse to the length of said work-arm, a feed-ring actuating shaft journaled within and extendin lengthwise of said work-arm, a pair of reciprocatory needles, a pair of rotary loop-takers journaled within said work-arm and complemental to said needles in the formation of stitches, said loop-takers having their axes of rotation disposed at opposite sides of said feedring and substantially parallel to the paths of needle reciprocation, a loop-taker actuating shaft journaled within said work-arm in substantial parallelism with said feed-ring actuating shaft, and means for rotating said shafts.

10. A feeding mechanism for sewing machines, comprising, a feed-ring bracket provided with an annular flange and having a. segmental feed-ring clearance recess, a feed-ring supported by said flange and freely rotatable thereupon, a retaining-plate detachably secured upon said bracket andconfining said feed-ring within said bracket recess, a rotary feed-ring actuating shaft, driving connections for rotating said feed-ring from said shaft, and means for rotating said actuating shaft.

11. A feeding mechanism for sewing machines,

comprising, a stationary feed-ring bracket'provided with an annular flange and. having a segmental feed-ring clearance recess, a. toothed feedring embracing and rotatably supported by said flange, a pinion rotatably supported upon said bracket in driving engagement with the teeth of said feed-ring within said bracket recess, a rotary feed-ring actuating shaft, and a pinion driving gear carried by said shaft.

12. A feeding mechanism for sewing machines, comprising, a stationary feed-ring bracket provided with an annular flange and having a segmental feed-ring clearance recess, a peripherally toothed feed-ring embracing and rotatably supported by said flange, a retaining plate detachably secured upon said bracket and confining said feed-ring within said bracket-recess, a pinion journaled upon said bracket for rotation about an axis substantially parallel to the axis of rotation of said feed-ring, said pinion extending into said bracket recess for driving engagement with said feed-ring, a, rotary shaft disposed in substantial parallelism with the axis of rotation of said feed-ring, and a pinion driving gear carried by said shaft.

13. In a sewing machine having a frame including a hollow work-supporting arm free at one end thereof, a stationary feed-ring bracket within said work-arm and provided with an annular flange, a feedring embracing said flange and supported thereby for rotation about an axis extending lengthwise of said work-arm, a reciprocatory needle having its path of reciprocation transverse to the axis and at one side of said feed-ring, a rotary loop-taker complemental to said needle in the formation of stitches, said loop-taker being disposed within said work-arm for rotation about an axis substantially parallel to and at the side of said feed-ring opposite to the path of reciprocation of said needle, a rotary loop-taker actuating shaft journaled in and extending lengthwise of said work-arm, and means for rotating said feed-ring.

14. In a sewing machine having a frame including a hollow work-supporting arm free at one end thereof, a stationary feed-ring supporting bracket within said work-arm and provided with an annular flange, a feed-ring embracing and rotatably supported by said flange, a feed-ring actuating shaft journaled in and extending lenthwise of said work-arm, driving connections for rotating said feed-ring from said shaft, a needle having a path of reciprocation transverse to the axis and at one side of said feed-ring, a loop-taker complemental to said needle in the formation of stitches and having its operative path of movement through said feed-ring, and means for actuating said loop-taker.

STEVEN PYLUCK.

Eli 

